/* ============================================================
   布局:官网头部条 + 平台导航栏 + 页脚
   风格参考青藤官网:白色导航栏 + 青藤青强调
   ============================================================ */

/* ---------- Logo 图片(横版 2126x828) ---------- */
.site-logo-img, .brand-logo img, .parent-logo-wrap img {
  display: block;
  max-height: 40px;
  width: auto;
  object-fit: contain;
}

/* ---------- 官网头部条 ---------- */
.parent-bar {
  background: #fff;
  border-bottom: 1px solid var(--border-soft);
  font-size: 13px;
}
.parent-bar-inner {
  display: flex; align-items: center; gap: 18px;
  height: 48px; position: relative;
}
.parent-link { display: inline-flex; align-items: center; gap: 10px; color: var(--text-muted); }
.parent-link:hover { color: var(--brand); }
.parent-logo-wrap { display: inline-flex; align-items: center; }
.parent-logo-wrap .site-logo-img { max-height: 30px; }
.parent-name { font-weight: 600; color: var(--text-muted); letter-spacing: 0.5px; }
.breadcrumb { color: var(--text-faint); }
.breadcrumb .sep { color: var(--accent); font-style: normal; margin: 0 4px; }
.online-widget {
  margin-left: auto; color: var(--accent2);
  font-family: var(--mono); font-size: 12px;
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
}
.online-widget .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent2); display: inline-block;
  animation: pulse 1.6s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(0,168,107,0.5); }
  50% { opacity: 0.6; box-shadow: 0 0 0 5px rgba(0,168,107,0); }
}

/* ---------- 平台导航栏 ---------- */
.main-bar {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.main-bar-inner {
  display: flex; align-items: center; gap: 24px; height: 64px;
}
.brand { display: inline-flex; align-items: center; gap: 6px; color: var(--text); }
.brand-logo { display: inline-flex; align-items: center; }
.brand-logo .site-logo-img { max-height: 36px; }
.brand-name {
  font-size: 17px; font-weight: 700; letter-spacing: 0.5px;
  color: var(--brand-dark); margin-left: 4px;
  border-left: 1px solid var(--border); padding-left: 12px;
}
.site-nav { display: flex; gap: 4px; margin-left: auto; }
.nav-link {
  padding: 8px 16px; border-radius: 8px; color: var(--text-muted);
  font-size: 14px; transition: all 0.18s ease;
}
.nav-link:hover { color: var(--brand); background: var(--accent-dim); }
.nav-link.active { color: var(--accent); background: var(--accent-dim); font-weight: 600; }

/* 汉堡按钮 */
.nav-toggle {
  display: none; flex-direction: column; justify-content: center; gap: 4px;
  width: 40px; height: 40px; background: transparent; border: 1px solid var(--border);
  border-radius: 8px; cursor: pointer; margin-left: auto; padding: 8px;
}
.nav-toggle span { display: block; height: 2px; background: var(--text); border-radius: 2px; transition: 0.25s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 页脚(青藤风格) ---------- */
.site-footer {
  background: #1a1b20; border-top: none;
  padding: 44px 0 26px; margin-top: 40px; font-size: 14px;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 30px; margin-bottom: 26px; }
.footer-col h4 {
  font-size: 14px; color: #6fd7ea; margin-bottom: 12px; letter-spacing: 0.5px;
}
.footer-col p { color: #a0a6b0; font-size: 13px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col li a { color: #a0a6b0; }
.footer-col li a:hover { color: #6fd7ea; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 18px;
  text-align: center; color: #8a8f99; font-size: 13px;
}
.footer-bottom p { margin-bottom: 6px; }
.concurrency-note { color: #6fd7ea; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .site-nav {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; background: #fff;
    border-bottom: 1px solid var(--border); padding: 10px; gap: 4px;
  }
  .site-nav.open { display: flex; }
  .nav-toggle { display: flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .online-widget { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .brand-name { font-size: 15px; }
  .parent-bar-inner { gap: 8px; }
  .breadcrumb { display: none; }
}